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排序方式: 共有153条查询结果,搜索用时 15 毫秒
31.
J. H. Field F. Kapusta L. Poggioli 《Zeitschrift fur Physik C Particles and Fields》1987,36(1):121-129
A detailed discussion is given of the hadronic and point-like contributions to theF 2 photon structure function (F 2 γ ) in both the naive parton model and QCD. The non-singlet part of the leading order solution, first found by Witten, is re-derived using the QCD improved parton model, enabling the hadronic and point-like terms to be clearly identified and correlated with observed jet structure in the final state. When important non leading-log terms are included, the sensitivity of the solution to Λ is found to be weak for allQ 2 values, and the all orders solution to be well approximated by theO(α s 2 solution. The approximations made in deriving the leading order solution are critically examined, and an approach enabling more quantitative tests of QCD to be made from measurements of the point-like (perturbative) component ofF 2 γ is suggested. 相似文献
32.
The screening of colour electric and magnetic fields and plasma oscillations in a high-temperature gluon plasma are investigated using linear response theory and self-consistent nonperturbative solutions to the Schwinger-Dyson equation. Static electric fields are screened, with
. This result is proven to be gauge invariant in two ways: by computing π00 in temporal axial, Coulomb and covariant gauges, and by computing the physical free energy of a heavy quark pair in the plasma in temporal axial gauge. To order g3 static magnetic fields are not screened. 相似文献
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33.
Garmash A Abe K Abe K Adachi I Aihara H Asano Y Aushev T Aziz T Bahinipati S Bakich AM Barbero M Bedny I Bitenc U Bizjak I Bondar A Bozek A Bracko M Brodzicka J Browder TE Chang P Chao Y Chen A Chen KF Chen WT Cheon BG Chistov R Choi Y Choi YK Chuvikov A Dalseno J Danilov M Dash M Dragic J Drutskoy A Eidelman S Epifanov D Fratina S Gabyshev N Gershon T Go A Gokhroo G Golob B Gorisek A Ha HC Hara T Hasegawa Y Hastings NC Hayasaka K Hayashii H Hazumi M Hokuue T Hoshi Y Hou S Hou WS Hsiung YB 《Physical review letters》2006,96(25):251803
We report results on a Dalitz analysis of three-body charmless B+/- --> K+/-pi+/-pi+/- decay including searches for direct CP violation. We report the first observation of the decay B+/- --> f2(1270)K+/- with a statistical significance above 6sigma. We also observe first evidence for large direct CP violation in the B+/- --> rho(770)0K+/- channel. The results are obtained with a data sample that contains 386 10(6) BB pairs collected at the Y(4s) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. 相似文献
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35.
K. Helariutta J.F.C. Cocks T. Enqvist P.T. Greenlees P. Jones R. Julin S. Juutinen P. Jämsen H. Kankaanpää H. Kettunen P. Kuusiniemi M. Leino M. Muikku M. Piiparinen P. Rahkila A. Savelius W.H. Trzaska S. Törmänen J. Uusitalo R.G. Allatt P.A. Butler R.D. Page M. Kapusta 《The European Physical Journal A - Hadrons and Nuclei》1999,6(3):289-302
Prompt and delayed γ-rays have been observed from very neutron deficient 192–195Po nuclei by using the recoil-decay tagging (RDT) and recoil gating techniques. The yrast levels up to the (10+) state in the 192Po were identified for the first time. Comprehensive data for 194Po rendered it possible to extend the yrast line and to observe several positive and negative parity non-yrast states. In
the odd-mass isotopes 193Po and 195Po, favoured and unfavoured states on top of the 13/2+ state have been identified. The results are discussed within the simple vibrator and rotor pictures as well as in the framework
of coexisting spherical and deformed-intruder structures.
Received: 5 July 1999 / Revised version: 7 September 1999 相似文献
36.
V.L. Eletsky B.L. Ioffe J.I. Kapusta 《The European Physical Journal A - Hadrons and Nuclei》1998,3(4):381-387
The mass shift Δmρ and width broadening ΔΓρ of ρ-mesons produced in heavy ion collisions is estimated using general formulae which relate the in-medium mass shift of
a particle to the real part of the forward scattering amplitude Re f(E) of this particle on constituents of the medium and
ΔΓ to the corresponding cross section. It is found that the mass increases by some tens of MeV but, more importantly, the
width becomes large, increasing by several hundred MeV at beam energies of a few GeV·A and by twice that amount at beam energies
of about a hundred GeV·A.
Received: 28 July 1998 相似文献
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38.
Kapusta JI 《Physical review letters》2004,93(25):251801
It is shown that Dirac-type neutrinos display BCS superfluidity for any nonzero mass. The Cooper pairs are formed by attractive scalar Higgs boson exchange between left- and right-handed neutrinos; in the standard SU(2) x U(1) theory, right-handed neutrinos do not couple to any other boson. The value of the gap, the critical temperature, and the Pippard coherence length are calculated for arbitrary values of the neutrino mass and chemical potential. Although such a superfluid could conceivably exist, detecting it would be a major challenge. 相似文献
39.
Schwanda C Abe K Abe K Abe T Adachi I Aihara H Akatsu M Asano Y Aushev T Bahinipati S Bakich AM Ban Y Banas E Bay A Bizjak I Bondar A Bozek A Bracko M Browder TE Chang MC Chao Y Cheon BG Choi Y Choi YK Chuvikov A Cole S Danilov M Dash M Dong LY Drutskoy A Eidelman S Eiges V Gabyshev N Gershon T Gokhroo G Golob B Hazumi M Higuchi I Hinz L Hokuue T Hoshi Y Hou WS Huang HC Iijima T Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Kang JH Kang JS Kapusta P Katayama N Kawai H Kichimi H Kim HJ 《Physical review letters》2004,93(13):131803
We have searched for the decay B+-->omegal(+)nu (l=e or mu) in 78 fb(-1) of Upsilon(4S) data (85x10(6)BB events) accumulated with the Belle detector. The final state is fully reconstructed using the omega decay into pi(+)pi(-)pi(0), combined with detector hermeticity to estimate the neutrino momentum. A signal of 414+/-125 events is found in the data, corresponding to a branching fraction of (1.3+/-0.4+/-0.2+/-0.3)x10(-4), where the first two errors are statistical and systematic, respectively. The third error reflects the estimated form-factor uncertainty. 相似文献
40.
Radek Macháň Peter Kapusta Martin Hof 《Analytical and bioanalytical chemistry》2014,406(20):4797-4813
We review the principles and applications of statistical filtering in multichannel fluorescence microscopy. This alternative approach to separation of signals from individual fluorophore populations has many important advantages, especially when spectral and/or temporal overlap, or the complicated nature of those signals, makes their discrimination or sorting impossible by means of hardware. This situation is typically encountered for biological samples. This review of well established statistical filtering techniques and of emerging, very promising new methods of analysis reveals remarkable progress in bioanalytical applications of fluorescence microscopy. 相似文献